On Mon, Jan 19, 2004 at 01:14:50PM -0800, Steven M. Schultz wrote: > On Mon, 19 Jan 2004 [EMAIL PROTECTED] wrote: > > > I am in doubt about what aspect ratio to use > > when encoding SVCDs from a widescreen source. > > 4/3 > > > giving a better quality. When playing the > > SVCD at a normal TV (aspect ratio 4:3), the > > DVD player will add black borders to fit > > the image into the TV screen. > > That is what you would expect to happen. > > As Alexei mentioned (and I have observed the same thing) many DVD/VCD > players do NOT perform the letterboxing function for SVCD/VCD. In > fact I have yet to encounter a DVD player that will pay attention to > the aspect ratio flags in a SVCD MPEG file.
Fortunatly my DVD Player (Gradient D-400) understands 16:9 SVCDs, doing the letterboxing correctly. > > Am I right expecting better quality results > > with a 16:9 aspect ratio in the SVCD? > > Marginally. The SVCD frame size is the same 480x480 for both 4/3 > and 16/9 - only the flags bits in the MPEG header are changed. > > With the flags set to 16/9 the display will be 854x480 rather than > 640x480 (if the flags are set to indicate 4/3). The visual quality > might actually go down a little since 480 pixels are being stretched > to 854 horizontally. And what does happens vertically at playback time when doing letterboxing. The black borders are not encoded in the movie and are added by the player. How that sould influence the quality? > Software players do the right thing so for computer based playing you > can use 16/9 SVCDs but so far the standalone players do not perform > the aspect conversion/letterboxing. Again, mine does :) ------------------------------------------------------- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. http://www.eclipsecon.org/osdn _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
